Thank you both for the tools an suggestions. I expected the response "there
are many variables" but this gives me a place to start in determining what
our configuration is capable of.
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On Wed, Jan 4, 2017 at 11:58 AM, Maged Mokhtar <mmokh...@petasan.org> wrote:
>
> if you are asking about what tools to use:
> http://tracker.ceph.com/projects/ceph/wiki/Benchmark_
> Ceph_Cluster_Performance
>
> You should run many concurrent processes on different clients
>
>
> *From:* Maged Mokhtar <mmokh...@petasan.org>
> *Sent:* Wednesday, January 04, 2017 6:45 PM
> *To:* John Petrini <jpetr...@coredial.com> ; ceph-users
> <ceph-users@lists.ceph.com>
> *Subject:* Re: [ceph-users] Estimate Max IOPS of Cluster
>
>
> Max iops depends on the hardware type/configuration for disks/cpu/network.
>
> For disks, the theoretical iops limit is
> read = physical disk iops x number of disks
> write (with journal on same disk) = physical disk iops x number of disks /
> num of replicas / 3
> in practice real benchmarks will vary widely from this, I've seen numbers
> from 30 to 80 % of theoretical value.
>
> When the number of disks/cpu cores is high, the cpu bottleneck kicks in,
> again it depends on hardware but you could use a performance tool such as
> atop to know when this happens on your setup. There is no theoretical
> measure of this, but one good analysis i find is Nick Fisk:
> http://www.sys-pro.co.uk/how-many-mhz-does-a-ceph-io-need/
>
>
> Cheers
> /Maged
>
> *From:* John Petrini <jpetr...@coredial.com>
> *Sent:* Tuesday, January 03, 2017 10:15 PM
> *To:* ceph-users <ceph-users@lists.ceph.com>
> *Subject:* [ceph-users] Estimate Max IOPS of Cluster
>
> Hello,
>
> Does any one have a reasonably accurate way to determine the max IOPS of a
> Ceph cluster?
>
> Thank You,
>
> ___
>
> John Petrini
>
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>
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>
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>
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